code: def setup(self, threads):
      rng = np.random.default_rng(8176)
      self.chunks = np.array_split(
          rng.standard_normal((250, 349)), threads
      )
  
imports: import numpy
  import timeit
  from concurrent.futures import ThreadPoolExecutor, wait
  from .common import Benchmark, safe_import
label_desc: Use image node_id 1 for calling the MedFilt2D obj's underlying member method code with example usage: obj.setup(threads) without return types